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Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/1930
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Buckland2008BirdConsInt18EstimatingBirdAbundance.pdf118.73 kBAdobe PDFView/Open
Title: Estimating bird abundance : making methods work
Authors: Buckland, Stephen T.
Marsden, Stuart J.
Green, Rhys E.
Keywords: Distance sampling surveys
Point-count surveys
Atlantic forest
Density
Conservation
Islands
Habitat
Census
Size
QL Zoology
Issue Date: Sep-2008
Citation: Buckland , S T , Marsden , S J & Green , R E 2008 , ' Estimating bird abundance : making methods work ' Bird Conservation International , vol 18 , no. S1 , pp. 91-108 .
Abstract: In many bird monitoring Surveys, no attempt is made to estimate bird densities or abundance. instead, counts of one form or another are made, and these are assumed to correlate with bird density. Unless complete Counts Oil Sample plots are feasible, this approach can easily lead to false conclusions, because detectability of birds varies by species, habitat, observer and many other factors. Trends in time of counts often reflect trends in detectability, rather than trends in abundance. Conclusions are further compromised when surveys are conducted at unrepresentative sites. We consider how to avoid these problems. We give a brief description of distance sampling methods, which allow detectability to be estimated. We consider strategies to ease their implementation, to enhance their reliability, to adapt the methods for difficult species, and to deal with circumstances in which representative sampling is problematic. We also consider some of the common problems encountered, and suggest solutions.
Version: Publisher PDF
Status: Peer reviewed
URI: http://hdl.handle.net/10023/1930
DOI: http://dx.doi.org/10.1017/S0959270908000294
ISSN: 0959-2709
Type: Journal article
Rights: Copyright © Birdlife International 2008. Published by Cambridge University Press, available from DOI: 10.1017/S0959270908000294
Appears in Collections:University of St Andrews Research
Mathematics & Statistics Research



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